Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / TextReader.cs / 1 / TextReader.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: TextReader ** ** ** Purpose: Abstract base class for all Text-only Readers. ** Subclasses will include StreamReader & StringReader. ** ** ===========================================================*/ using System; using System.Text; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Reflection; using System.Security.Permissions; namespace System.IO { // This abstract base class represents a reader that can read a sequential // stream of characters. This is not intended for reading bytes - // there are methods on the Stream class to read bytes. // A subclass must minimally implement the Peek() and Read() methods. // // This class is intended for character input, not bytes. // There are methods on the Stream class for reading bytes. [Serializable()] [ComVisible(true)] public abstract class TextReader : MarshalByRefObject, IDisposable { public static readonly TextReader Null = new NullTextReader(); protected TextReader() {} // Closes this TextReader and releases any system resources associated with the // TextReader. Following a call to Close, any operations on the TextReader // may raise exceptions. // // This default method is empty, but descendant classes can override the // method to provide the appropriate functionality. public virtual void Close() { Dispose(true); } public void Dispose() { Dispose(true); } protected virtual void Dispose(bool disposing) { } // Returns the next available character without actually reading it from // the input stream. The current position of the TextReader is not changed by // this operation. The returned value is -1 if no further characters are // available. // // This default method simply returns -1. // public virtual int Peek() { return -1; } // Reads the next character from the input stream. The returned value is // -1 if no further characters are available. // // This default method simply returns -1. // public virtual int Read() { return -1; } // Reads a block of characters. This method will read up to // count characters from this TextReader into the // buffer character array starting at position // index. Returns the actual number of characters read. // public virtual int Read([In, Out] char[] buffer, int index, int count) { if (buffer==null) throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer")); if (index < 0) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (count < 0) throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (buffer.Length - index < count) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); int n = 0; do { int ch = Read(); if (ch == -1) break; buffer[index + n++] = (char)ch; } while (n < count); return n; } // Reads all characters from the current position to the end of the // TextReader, and returns them as one string. public virtual String ReadToEnd() { char[] chars = new char[4096]; int len; StringBuilder sb = new StringBuilder(4096); while((len=Read(chars, 0, chars.Length)) != 0) { sb.Append(chars, 0, len); } return sb.ToString(); } // Blocking version of read. Returns only when count // characters have been read or the end of the file was reached. // public virtual int ReadBlock([In, Out] char[] buffer, int index, int count) { int i, n = 0; do { n += (i = Read(buffer, index + n, count - n)); } while (i > 0 && n < count); return n; } // Reads a line. A line is defined as a sequence of characters followed by // a carriage return ('\r'), a line feed ('\n'), or a carriage return // immediately followed by a line feed. The resulting string does not // contain the terminating carriage return and/or line feed. The returned // value is null if the end of the input stream has been reached. // public virtual String ReadLine() { StringBuilder sb = new StringBuilder(); while (true) { int ch = Read(); if (ch == -1) break; if (ch == '\r' || ch == '\n') { if (ch == '\r' && Peek() == '\n') Read(); return sb.ToString(); } sb.Append((char)ch); } if (sb.Length > 0) return sb.ToString(); return null; } [HostProtection(Synchronization=true)] public static TextReader Synchronized(TextReader reader) { if (reader==null) throw new ArgumentNullException("reader"); if (reader is SyncTextReader) return reader; return new SyncTextReader(reader); } [Serializable()] private sealed class NullTextReader : TextReader { public override int Read(char[] buffer, int index, int count) { return 0; } public override String ReadLine() { return null; } } [Serializable()] internal sealed class SyncTextReader : TextReader { internal TextReader _in; internal SyncTextReader(TextReader t) { _in = t; } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override void Close() { // So that any overriden Close() gets run _in.Close(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] protected override void Dispose(bool disposing) { // Explicitly pick up a potentially methodimpl'ed Dispose if (disposing) ((IDisposable)_in).Dispose(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Peek() { return _in.Peek(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Read() { return _in.Read(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Read([In, Out] char[] buffer, int index, int count) { return _in.Read(buffer, index, count); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int ReadBlock([In, Out] char[] buffer, int index, int count) { return _in.ReadBlock(buffer, index, count); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override String ReadLine() { return _in.ReadLine(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override String ReadToEnd() { return _in.ReadToEnd(); } } } }
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- PeerNode.cs
- ComPlusAuthorization.cs
- ValidationRuleCollection.cs
- bindurihelper.cs
- SymbolMethod.cs
- DefaultConfirmation.cs
- CorruptStoreException.cs
- ServiceModelSecurityTokenRequirement.cs
- CommentEmitter.cs
- ZipIOBlockManager.cs
- Rethrow.cs
- UITypeEditors.cs
- TextContainerChangedEventArgs.cs
- BrowserTree.cs
- DataGridViewImageColumn.cs
- Normalization.cs
- SettingsProviderCollection.cs
- Hex.cs
- CultureInfoConverter.cs
- ComProxy.cs
- DbFunctionCommandTree.cs
- XmlSchemaComplexContentRestriction.cs
- TransformProviderWrapper.cs
- RegistryExceptionHelper.cs
- CheckBox.cs
- LineSegment.cs
- SafeHandles.cs
- DefaultValueTypeConverter.cs
- x509store.cs
- OutputWindow.cs
- ThicknessAnimation.cs
- FileVersionInfo.cs
- Compiler.cs
- DeclarativeCatalogPart.cs
- ListBox.cs
- IgnoreDeviceFilterElement.cs
- NavigationEventArgs.cs
- InternalCache.cs
- PasswordBoxAutomationPeer.cs
- sqlser.cs
- RC2.cs
- CodeDomLoader.cs
- ClientOptions.cs
- StickyNoteContentControl.cs
- ExpressionPrinter.cs
- SimpleApplicationHost.cs
- ModelProperty.cs
- UnionCqlBlock.cs
- SpecialTypeDataContract.cs
- ActiveDocumentEvent.cs
- BooleanToVisibilityConverter.cs
- Panel.cs
- MissingSatelliteAssemblyException.cs
- IPipelineRuntime.cs
- GridViewRow.cs
- RuleSetDialog.cs
- TextElementCollection.cs
- SpanIndex.cs
- ButtonStandardAdapter.cs
- BindStream.cs
- IResourceProvider.cs
- ParameterInfo.cs
- IncrementalReadDecoders.cs
- VolatileEnlistmentMultiplexing.cs
- dbdatarecord.cs
- DES.cs
- SqlWriter.cs
- FormattedTextSymbols.cs
- basenumberconverter.cs
- autovalidator.cs
- SoapInteropTypes.cs
- TextEffectResolver.cs
- DbParameterHelper.cs
- ReverseInheritProperty.cs
- DefaultEventAttribute.cs
- SspiWrapper.cs
- Binding.cs
- ContainerUtilities.cs
- TemplatedWizardStep.cs
- ListViewVirtualItemsSelectionRangeChangedEvent.cs
- IndexerNameAttribute.cs
- DefaultCommandConverter.cs
- ConfigurationStrings.cs
- SizeAnimationUsingKeyFrames.cs
- DictionarySectionHandler.cs
- HtmlShim.cs
- WrappedKeySecurityTokenParameters.cs
- Dynamic.cs
- Misc.cs
- AnalyzedTree.cs
- KeyEventArgs.cs
- ContextMenu.cs
- ParallelDesigner.xaml.cs
- SingleSelectRootGridEntry.cs
- UInt64Storage.cs
- HandleCollector.cs
- InstalledVoice.cs
- DefaultIfEmptyQueryOperator.cs
- MetadataItemSerializer.cs
- RewritingProcessor.cs